Are you bored with your slick Windows 7 or OSX GUI? Have Ubuntu's cutting-edge package updates got you down? Do you like installing archaic Enterprise editions of Linux just for fun? CentOS might be right up your alley. This is a brief tutorial on how to install CentOS within VirtualBox. You'll need a few hours to kill, and a working VirtualBox installation. (I won't go into the details of how to install VBox; it's pretty easy, and besides, if you're thinking of installing CentOS for fun, you probably already have it.)